Some advice:
It is easy to book via e.g.
Booking Com.
It is possible to find hotels
(with individual rooms) with prices starting
at 30 euros/night.
In principle, all hotels not far from metro line B
are convenient. Many are in city center.
Out of center Ramonville (terminus) is at one stop
from the station Université Paul Sabatier.
Among hotels at Ramonville:
Hotel F1 Toulouse Ramonville (approx. 30 euros/night),
Lidotel (approx. 40 euros/night), Comfort Hôtel Toulouse Sud (approx. 45
euros/night).
Others: Ibis Budget Toulouse Centre Gare (approx. 45 euros/night),
Hotel des Ambassadeurs (approx. 52 euros/night),
there are many non-expensive appart-hotels e.g. Aparthotel Adagio Access
Toulouse (for about
45-55 euros/night).